If ever you're concerned about ducks and cold/snow, all of mine slept outside last night and were covered in snow...lol.
https://drive.google.com/file/d/1NamRMAtoU-hPMxlO-6-AoxLMrVF5uVaQ/view?usp=sharing
Mine have been eating and drinking just fine. I left the run door open today to see if they would venture out, but they stayed inside the coop all day, so I guess they're a bit smarter than I thought.
I came here with the same question. Mine have been closed up in the run since Friday. They've spent most of the time in the coop, although I have them on camera sleeping outside in negative weather when the wind died down. I've been taking them water every few hours. They are all eating and...